XML 57 R44.htm IDEA: XBRL DOCUMENT v3.8.0.1
Accounts Receivable (Allowance) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for doubtful accounts:      
Balance, beginning of period $ 90 $ 115 $ 171
Provisions for losses on accounts receivables, net of adjustments 179 (25) (48)
Accounts receivable written off, net of recoveries (150) 0 (8)
Balance, end of period $ 119 $ 90 $ 115